이유
A cause, explanation, or justification for an action or event.
Examples
3 of 5내가 이곳에 온 이유는 너를 돕기 위해서야.
The reason I came here is to help you.
결정이 지연된 이유가 무엇입니까?
What is the reason for the delayed decision?
환경 오염의 주된 이유는 탄소 배출입니다.
The main reason for environmental pollution is carbon emissions.
Word Family
Memory Tip
I-yu: Sounds like 'Eww' - why are you doing that? Give me a reason!
Quick Quiz
사람들이 도시로 몰리는 ( )는 일자리 때문입니다.
Correct!
The correct answer is: 이유
Examples
내가 이곳에 온 이유는 너를 돕기 위해서야.
everydayThe reason I came here is to help you.
결정이 지연된 이유가 무엇입니까?
businessWhat is the reason for the delayed decision?
환경 오염의 주된 이유는 탄소 배출입니다.
academicThe main reason for environmental pollution is carbon emissions.
건강상의 이유로 휴직을 신청했습니다.
formalI applied for a leave of absence for health reasons.
이유가 뭐야?
informalWhat's the reason?
Word Family
Common Collocations
Common Phrases
그럴 만한 이유
a good reason for that
이유 불문하고
regardless of the reason
여러 가지 이유
various reasons
Often Confused With
Wonin is more scientific/direct cause; Iyu is a general reason or justification.
Usage Notes
Fundamental for IELTS Writing Task 2 when explaining 'Reasons and Solutions'.
Common Mistakes
Avoid repeating '이유' too much; use synonyms like '원인' or '근거'.
Memory Tip
I-yu: Sounds like 'Eww' - why are you doing that? Give me a reason!
Word Origin
From Sino-Korean 理由: 理 (reason/logic) and 由 (from/cause).
Grammar Patterns
Quick Quiz
사람들이 도시로 몰리는 ( )는 일자리 때문입니다.
Correct!
The correct answer is: 이유
Related Grammar Rules
Related Vocabulary
More general words
연기하다
B1To delay or postpone a planned event or task to a later time. It can also mean to act in a play or movie.
계획
B1A detailed proposal for doing or achieving something in the future. It involves deciding on steps and resources needed to reach a goal.
성실하다
B1To be diligent, faithful, and sincere in performing one's duties or tasks.
방향
B1The course along which someone or something moves, or the general way in which a situation is developing.
해외
B1A location or area outside of one's own country, typically across the sea; international territories.
실패
B1Lack of success or the omission of expected or required action. It involves not meeting a desired goal or standard.
제공
B1The act of supplying or providing something that is wanted or needed. It is a very common verb in business and research contexts (e.g., providing data).
해롭다
B1Causing or likely to cause harm. It describes things that have a negative impact on health, environment, or society.
실제적
B1Relating to or concerned with facts or reality rather than theory or imagination; practical and useful in a real-world situation.
중요도
B1The degree or level of being important; importance measured as a quantity or rank.
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